Technical Roadmap

Naming a Variable in Python

Before creating a variable let's learn some rules to name a variable.

What is an Identifier?

Identifier is a specific name used to identify a variable, function, class, module, or other object. We use this name to access the data we stored in memory

The Logicoria Tip

An identifier is like an Aadhaar ID: just as two people cannot have the same ID, two variables in the same code cannot share the same name.

Rules for Naming a Variable

Use only letters (a-z, A-Z), digits (0-9), and underscores (_).
An identifier cannot start with a number.
Python is case-sensitive. Age, age, and AGE are all different variables.
You cannot use Python's reserved keywords to name a variable..
Cannot use symbols like @, $, %, !, or spaces anywhere in the name.

PYTHON

name="Logicoria"
article_name="Naming a variable"
print(name)
print(article_name)

Output

Logicoria
Naming a Variable

Snake Case: Use lowercase with underscores for variables.
• Example: user_name
Pascal Case: Start every word with a capital letter for Classes.
• Example: UserProfile
Constants: Use ALL CAPS for values that never change.
• Example: PI = 3.14

Naming Comparisons

Good Practice	Bad Practice
`user_age = 20` (Descriptive)	`a = 20` (Vague)
`is_logged_in = True` (Clear intent)	`var = True` (Meaningless)
`total_price = 50.5` (Snake Case)	`Totalprice = 50.5` (Messy casing)

Quick Revision

Letters, digits, and underscores (_) only.
Must start with a letter or underscore. No digits.
age and Age are different variables.
Never use reserved words